Recently Active Optics Questions

A man wants to produce sound of frequency 680 Hz using a closed organ pipe of length 34cm. What should he do? a. He should break the close part of pipe. b. He should apply more and more pressure to produce then open end c. he ...

a parallel beam of light enters a clear plastic bead 2.5 cm in diameter and index 1.4. at what point beyond the bead are these rays brought to a focus ???? ...

Firse CHANGE!!!! DOES THE FOL. comp GIVE +VE neutral FeCl3 Test ??? If not y not ??? *Image* ...

1.A young's double slit expt is performed with white light,then A)The central fringe will be white B)There will not be a completely dark fringe C)The fringe next to the central will be red D)The fringe next to the central wil ...

pls give me a detaild explanation abt sign convention for the pbm. 1)Two equiconvex lenses of focal lengths 30 cm and 70 cm,made of material of refractive index=1.5; are held in contact coaxially by a rubber band round their ...

Paragraph for Question Nos. 41 to 43 The distance between the objective and the eyepiece in a microscope set in a horizontal direction is 12 cm and their respective focal lengths 0.6 cm and 5 cm. If a clear image is to be obt ...

metallic plates P(collector) & Q(emitter) are separated by a distance of 0.10m. These r connected through an ammeter without any cell. a magnetic field B exists parallel to the plates. light of wavelengths between 400nm & 60n ...

A ray of light is incident on a rotating plane mirror. If angular speed of mirror is w, what is the angular speed of the reflected ray? ...

You are at one end of long airport runway. A vertical temperature gradient in the air results in the refractive index variation with height as n = n1( 1+ ay) where n1 is the refractive index at the runway a = 1.5 * 10^(-6) pe ...

THE MAXIMUM VALUE OF INDEX OF REFRACTION OF A MATERIAL OF A PRISM WHICH ALLOWS THE PASSAGE OF LIGHT THROUGH IT WHEN THE REFRACTING ANGLE OF THE PRISM IS 'A' IS a)(1-sinA/2)^1/2 b)(1-cotA/2)^1/2 c)(1-(tanA/2)^2)^1/2 d)(1+(cotA ...

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Q73 A ball is kept at a height of h above the surface of a heavy transparent sphere made of a material of refractive index μ. The radius of the sphere is R. At t=0, the ball is dropped to fall normally on the sphere. Find th ...

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Can anybody explain me HCV ques. no. 34 from the chapter sound waves?? ...

1) A moving hydrogen atomin ground state, causing radiation of several wavelengths, the longest of which is 1880 nm. From the consideration of the loss in KE in collision, what is the velocity above which the atom has to move ...

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When the voltage applied to an X-ray tube is increased from V1 = 40 kV to 200 kV the wavelength interval between the Kα line and the short-wave cut off frequency of the continuous X-ray spectrum increases by a factorξ = 2. ...

*Image* a convergent beam is incident on two slabs placed in contact as shown .in fig where will the rays finally converge? sum 1 pl answer yaar ...

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Optical riddle ................................................................................. Newton told us the three laws of motion , But he also gave us a formula in optics which u have to mention . ...

*Image* *Image* whats the concept behind ...... this concept is asked frequently in the JEE ...

In an experiment to determine the focal length (f) of a concave mirror by the u-v method, a student places an object pin A on the principal axis at a distance x from the pole P. The student looks at the pin and its inverted i ...

a radioactive nucleus of mass M emits an alpha particle of mass m and recoils freely. if the kinetic energy of the alpha particle is K, find the kinetic energy of the daughter nucleus. ...

a short linear object of length b lies along axis of a concave mirror of focal length f at a distance u from the pole of mirror.The size of image is aprox. equal to??? ...

A plane miror is moving with velocity 4i+5j+8k.A point object in front of mirror moves with velocity 3i+4j+5k.Here k is along normal to plane mirror and facing towards object.Then velocity of image is ???? Ans: 3i+4j+11k ...

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